Nick Bauman will be going over some of the basics of plasma cutting on January 6th at the Hack Factory. More information about the plasma cutter event is over on the Fourm. Photo by dav.
The plasma cutter will cut anything that conducts electricity, although I think some things you could theoretically cut you would not ever want to, such as magnesium or galvanized steel. Everything you mention can be cut by this plasma cutter.